Company Filing History:
Years Active: 1982-1984
Title: Innovations of Atsutoshi Doi in Semiconductor Laser Technology
Introduction
Atsutoshi Doi is a prominent inventor based in Ohme, Japan, known for his significant contributions to semiconductor laser technology. With a total of 3 patents to his name, Doi has made strides in enhancing the performance and reliability of semiconductor lasers.
Latest Patents
Doi's latest patents include a semiconductor laser device featuring a buried-heterostructure design. This innovative device incorporates a mesa-shaped optical confinement region that contains an active layer and a clad layer, all situated on a semiconductor substrate. The design includes a burying layer that encapsulates both side surfaces of the region, along with at least one p-n junction formed within the burying layer. This configuration allows for operation under a reversely biased state, significantly reducing leakage current and variance in threshold current values while protecting the multi-layer semiconductor surfaces.
Another notable patent by Doi describes a semiconductor laser device that prevents catastrophic degradation. This device consists of an active region made from a semiconductor material, confined by a semiconductor region with a different composition. The design allows for controlled current flow through the active region, even at field strengths below the degradation threshold, ensuring the device's longevity and reliability.
Career Highlights
Atsutoshi Doi is currently employed at Hitachi, Ltd., where he continues to innovate in the field of semiconductor technology. His work has been instrumental in advancing the capabilities of semiconductor lasers, making them more efficient and durable.
Collaborations
Doi has collaborated with notable colleagues, including Motohisa Hirao and Michiharu Nakamura, contributing to the development of cutting-edge technologies in semiconductor lasers.
Conclusion
Atsutoshi Doi's contributions to semiconductor laser technology have established him as a key figure in the field. His innovative patents reflect a commitment to enhancing the performance and reliability of these devices, paving the way for future advancements.